In "Balance of Terror", the original script spoke of Romulans using industrial espionage to design their ship. Hence, Wah Chang was told to create a Romulan ship that looked a bit like the Enterprise, so that Stiles' paranoia about spies would gain some credibility. The final script dropped the industrial espionage angle, but the Romulan design still retained its Federation looks.

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Oh, I did not know that the original plot called for the Romulans to be using industrial espionage.

In "The Enterprise Incident", the Klingon ship model was used for Romulan ships. Two reasons have been quoted: either the original Romulan model was lost (misplaced, broken, or stolen and/or destroyed by Chang who felt ill compensated for his work)

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Was Wah Chang ill-compensated for his work?

or then the producers wanted to showcase the expensive Klingon model instead of the cheaper and older design.

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The Romulan Bird-of-Prey was created before the Klingon D-7 design?

This prompted the script editors to insert the bit about Klingon-Romulan cooperation. Or in fact, the bit about Romulans using ships of Klingon design, which may mean anything from cooperation to copying to outright theft.

It's a separate issue whether the Romulan ship was supposed to have warp drive.

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From what I remember in that episode Scotty said the Romulans only had basic impulse. However, the ship did get pretty far out into space (and traverse a considerable distance even in the episode, if I recall) -- to the point where warp-drive would be the only realistic explanation. That and the fact that it has Warp-Nacelles.

And certainly nothing in the episode indicates that the Romulans as a species would be unfamiliar with warp: their weapons can outwarp the best Starfleet starships, after all!

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When you say "outwarp" do you mean "out-do"?

From what I remember the Plasma-Torpedo was a sublight weapon* -- and would appear to be a ball of plasma hurled out from the ship (the plasma-ball was transparent and did not appear to have any solid mass in the center), although it's not even clear in TOS whether the Photon torpedo was supposed to be a solid mass either (In fact I've heard some explanations which said they were matter and anti-matter seperated by magnaphoton-fields, and they simply looked like comets shot out of the ship) and was only made clear in TMP when Chekov stated that they were taking on photon-torpedoes while the ship was in spacedock (However even the special-effects guys still largely assumed they were just balls of plasma, energy and deadliness) and visually seen the first time (just the torpedo by itself) in TWOK.

CuttingEdge100
* - While technically a stream of plasma flung out of a ship cannot exceed the speed of light, technically a ball of matter and anti-matter with magnetic-energy fields sperating them couldn't exceed the speed of light either -- however Photon Torpedoes were routinely fired at warp-speed, as were the phasers (which only traveled at the speed of light)

What Scotty says is that the Romulan power generation is "simple impulse" which is not the same thing as their propulsion being simple impulse. All of the available evidence suggests that building a sublight ship as your new weapon would be incredibly silly. The Enterprise had to go to warp to outrun just the plasma weapon's maximum range, so it doesn't seem likely that the BOP wouldn't have had either warp or some other FTL system. It simply wouldn't be practical.

All of the available evidence suggests that building a sublight ship as your new weapon would be incredibly silly. The Enterprise had to go to warp to outrun just the plasma weapon's maximum range, so it doesn't seem likely that the BOP wouldn't have had either warp or some other FTL system. It simply wouldn't be practical.

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Well, technically it takes time to transition over from impulse to warp... a few seconds... it is possible that the plasma torpedo would be able to hit you before you'd make warp.

I'm not really sure about fusion power. I know in Star Wars fusion engines have appeared in several species, but are described as being less efficient than the ion engines found more commonly. I can't recall if fusion propulsion has been mentioned much in Trek, unfortunately.

Internal combustion is the basis for automobile propulsion, so I guess it can't be used anywhere else.

Fusion can and likely is used for warp propulsion. I don't know where Trek gets this silly notion that everyone uses the same power system for their warp drives and the same drive type as well. It's ludicrous in many ways.